Pack out in an already too large boot

So, Ive been in the same boots for about 4 years, they've been too large since the day I got them (should be in a 26.5-27, the shells are 29). I have been messing around with them recently trying to get them more snug, I have butterfly spacers around my achilles which works for the toe and heel. The problem now is the top of my foot and top of the ankle. I haven't adjusted any buckles yet but I am thinking about it, might just put a wedge under my heel or raise the foot bed. Any suggestions will help!? the boots are Solomon impact 8's